Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

Re: Are Roof Top Units considered Dead or Live Loads?

[Subject Prev][Subject Next][Thread Prev][Thread Next]
If you are designing with wood framing, ask yourself if you think it might be there continuously for more than ten years.  If so, the NDS will require you to use a Cd=0.9, the same as Dead Load.  On this basis, I always consider roof top equipment as "Dead Loads" keeping the LL as a reserve for the dumb things owners sometimes do.
Bill Cain  SE
Berkeley CA
In a message dated 1/4/2005 6:58:22 AM Pacific Standard Time, dboltz(--nospam--at) writes:
I've had different answers from various Senior Engineers.  Some say that since the RTU weight does not vary in magnitude and location, it is a DEAD LOAD.  Others say that if the RTU is changed or moved in the future, it's weight and location would be considered a LIVE LOAD. 

Any help is appreciated.

Sent via the WebMail system at


******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at:
*   This email was sent to you via Structural Engineers
*   Association of Southern California (SEAOSC) server. To
*   subscribe (no fee) or UnSubscribe, please go to:
*   Questions to seaint-ad(--nospam--at) Remember, any email you
*   send to the list is public domain and may be re-posted
*   without your permission. Make sure you visit our web
*   site at:
******* ****** ****** ****** ******* ****** ****** ********
Bill Cain, S.E.
Berkeley CA